JP2003166257A - Immersed tube for submarine tunnel, reaching method of shield machine to immersed tube and starting method of shield machine from immersed tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an immersed tube for marine tunnel capable of precisely connect a submarine immersed tube and an underground tunnel in a short time, a departure method of a shield machine to the immersed tube and a start method of the shield machine from the immersed tube. <P>SOLUTION: A slide hood 6 serving as a guide at the start and departure of a shield machine S is installed retractably in the immersed tube body 4 submerged in the sea bottom 1 to construct a marine tunnel. The slide hood 6 is projected from the opening of the immersed tube 3 toward the shore side rising port 2, and the shield machine S which has proceeded from the shore while excavating is intruded into the slide hood 6. In this way, even if there is an executional inevitable gap L between the immersed tube 3 and the shore side rising port 2, the shield machine S which has proceeded while excavating from the shore can be accurately intruded into the immersed tube 3 without refilling the gap. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a submerged box for a submarine tunnel, a method for reaching a submerged box with a shield machine, and a method for starting a shield machine from the submerged box.

[0002]

2. Description of the Related Art As a method for constructing an undersea tunnel, a construction method using a submerged box is known. In this construction method, referring to FIG. 9, a plurality of submerged boxes b are connected to each other to be installed on the seabed a, and the submerged boxes b at both ends thereof are connected to a tunnel c dug from the land side to construct an undersea tunnel. Conventionally, the connection between the submerged box b and the land-side tunnel c has been performed by civil engineering work.

That is, since it is necessary to set a certain gap between the submerged box b and the land-side standing upper part d in order to install the submerged box b, the backfill material e such as underwater concrete e
After being filled and solidified, the solidified backfill material e was excavated from the land side tunnel c side or the submerged box b side by using a civil engineering machine such as a backhoe to connect the two.

However, such civil engineering work imposes a heavy human burden. Therefore, as shown in FIG. 9, the present inventors constructed a land side tunnel c by a shield machine S, excavated the backfill material e solidified by the shield machine S, and directly installed the machine S into a submerged box b. We devised a method of invading the inside and connecting the submerged box b and the land side tunnel c.

[0005]

However, even in the method using the shield machine S, the backfill material e is provided between the submerged box b and the land-side upright part d in order to secure a layer to be excavated in the machine S. Since the work of filling is necessary and the waiting time until the backfilling material e is solidified is required, an increase in construction cost and a prolonged construction period cannot be avoided.

Further, when the shield machine S emerges from the land-side standing upper part d and excavates the backfill material e, the machine S may sink due to its own weight and may not properly enter the submerged box b. This is because the backfill material e (such as underwater concrete) is softer than the land-side standing upper portion d (rock etc.) even though it is solidified.

The object of the present invention, which was devised in consideration of the above circumstances, is to provide a submerged box for a submarine tunnel and a submerged box capable of accurately connecting a submarine submerged box and a land side tunnel at low cost and in a short period of time. It is to provide a method for reaching a shield machine and a method for starting a shield machine from a submerged box.

[0008]

In order to achieve the above object, a submerged box for a submarine tunnel according to a first invention is a submerged box body that is submerged in the seabed to construct a subsea tunnel. A slide hood, which serves as a guide when reaching, is provided so that it can be retracted.

Further, according to the second aspect of the present invention, the method for reaching the shield machine to the submerged box receives the shield machine excavated from the land side inside the submerged box installed near the land side upright part of the seabed. At this time, the slide hood is projected from the opening of the submerged box toward the land side upright part, and the shield machine dug from the land side is allowed to enter the inside of the slide hood.

Further, according to a third aspect of the present invention, there is provided a method of starting a shield machine from a submerged box, when the shield machine is started from the inside of the submerged box installed near the land side rising part of the seabed to the land side. The slide hood is projected from the opening of the box toward the land-side upright part, and the shield machine is started from the inside of the slide hood to the land-side upright part.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 1, a submerged box 3 is installed on the seabed 1 near the land-side standing upper part 2.
A gap L is set between the submerged box 3 and the land-side upright 2 to some extent in the installation work of the submerged box 3.

The submerged box 3 has a submerged box main body 4 formed of concrete or the like in a tubular shape, and a slide hood 6 (made of a steel plate) housed in the submerged box main body 4 and projecting and retracting from an opening by a jack 5. As shown in FIG. 2, the jack 5 has a stroke that allows the slide hood 6 to be pushed out until it abuts against the land-side upright 2.

Between the outer peripheral surface of the slide hood 6 and the inner peripheral surface of the submerged box body 4, a pedestal 7 is provided for supporting the slide hood 6 on the submerged box body 4 and for aligning the axes of both.
Is installed. The pedestal 7 is a slide hood 6.
It may be arranged only below the slide hood 6 and the upper one may be omitted, with an emphasis on supporting the weight of.

A first seal 8 is provided on the inner peripheral surface of the submerged box body 4 on the side of the opening so as to stop the water from the outer peripheral surface of the slide hood 6. As the first seal 8, a so-called lip seal similar to an entrance seal provided at a start opening of a vertical shaft when a normal ground shield machine starts from the vertical shaft is used (see FIG. 5). The first seal 8 may be provided in a plurality of rows with the pedestal 7 interposed therebetween.

As shown in FIG. 1, a partition 9 is detachably provided at the end of the slide hood 6 on the inner side of the submerged box. The partition wall 9 partitions the interior of the submerged box 3, and in FIG. 1, the right side thereof is the seawater state W and the left side thereof is the air state A. A valve 10 for drainage is provided under the partition wall 9.
Is provided. Valve 10 is normally closed,
Opened when draining.

As shown in FIG. 3, when the shield machine S enters the slide hood 6, the inner surface of the slide hood 6 is stopped between the shield machine S and the outer peripheral surface (shield frame 20). Second seal 11 for watering
Is provided. As shown in FIG. 5, the second seal 11 is a so-called inflat seal that expands and stops water by injecting a working fluid.

That is, the second seal 11 is an annular groove 1 formed on the inner peripheral surface of the slide hood 6 along the circumferential direction.
2 is made of a flexible film material such as rubber attached so as to cover the same. And the second seal 11
The (membrane material) expands when the working fluid 13 (air, water, oil, etc.) is injected into the inside, and is pressed against the outer peripheral surface (shield frame 20) of the shield machine S, and the slide hood 6 and the shield machine. Stop water between S and.

If the injection of the working fluid 13 is stopped,
The second seal 11 contracts, separates from the outer peripheral surface (shield frame 20) of the shield machine S, and the water stop is released. At this time, the contracted second seal 11 does not interfere with the shield machine S that enters the slide hood 6. The injection of the working fluid into the inside of the second seal 11 is
It is performed through a passage 14 formed in the plate thickness of the slide hood 6. Further, in the illustrated example, the second seal 12 is provided in two rows, but it may be one row or three or more rows.

A method of intruding the shield machine S excavated from the land side into the submerged box 3 having the above structure will be described.

First, as shown in FIG. 1, the submerged box 3 is installed in the vicinity of the land-side rising part 2 of the seabed 1. At this time, a gap L is set between the submerged box 3 and the land-side upright 2 to some extent in installation work of the submerged box 3. After that, submerged box 3
The inside of the partition 9 is drained to the air state A on the left side of the partition wall 9 and to the seawater state W on the right side of the partition wall 9. On the other hand, the shield machine S excavated from the land side on the ground is directly faced to the opening of the submerged box 3 in the land-side upright 2.

Next, as shown in FIG. 2, the jack 5 is extended to cause the slide hood 6 to project from the opening of the submerged box body 4, and the tip of the hood 6 is brought into contact with the land-side standing portion 2. At this time, water is stopped between the inner peripheral surface of the submerged box body 4 and the outer peripheral surface of the slide hood 6 by the first seal 8 (lip seal) (see FIG. 5). In addition, the second seal 11 is contracted without injecting the working fluid 13 to avoid interference with the shield machine S that enters the slide hood 6.

Next, as shown in FIG. 3, the shield machine S, which has been standing by in the land-side upright 2, is advanced to enter the slide hood 6. Then, as shown in FIG. 5, the second seal 11 is expanded by injecting the working fluid 13 and pressed against the outer peripheral surface (shield frame 20) of the shield machine S, so that the space between the slide hood 6 and the shield machine S is reduced. Stop water. As described above, the water is stopped by the first seal 8 between the submerged box body 4 and the slide hood 6, and the second seal 11 is provided between the slide hood 6 and the shield machine S.
The water is stopped by the tail seal 16 of the machine S between the shield machine S and the existing segment 15.

2 to 3, the slide hood 6 serves as a guide when the shield machine S in the land-side standing upper part 2 enters the slide hood 6, so that FIG.
It is not necessary to fill the backfill material e as a layer to be excavated between the submerged box b and the land-side upright portion d as in the type shown in FIG. Therefore, according to the present embodiment, the work of filling the backfill material between the submersible box 3 and the land-side upright part 2 is not necessary, and the waiting time until the backfill material is solidified is also eliminated. Not only can the construction cost be reduced, but the construction period can also be shortened.

Further, in this embodiment, the shield machine S
When entering the inside of the slide hood 6, the weight of the machine S is supported by the slide hood 6 serving as a guide. Therefore, there is a problem in the type of FIG.
The problem of the sinking of the machine S between and can be avoided.
Further, in FIG. 2, when the specific gravity of the shield machine S (the specific gravity including the internal air) is smaller than that of seawater, the machine S tries to float when it goes out of the land-side upright portion 2, but the lift is also caused by the hood 6. It can be avoided because it is pressed down.

That is, according to this embodiment, as shown in FIG. 2, even if the space L unavoidable in construction is set between the submerged box 3 and the land-side upright portion 2 as shown in FIG. By projecting the slide hood 6 from the submersible box body 4 to the land-side upright portion 2, the slide hood 6 guides the shield machine S dug from the land side as shown in FIG.
Since it can be accurately made to enter the submerged box 3, there is no need to fill the backfill material e between the submerged box 3 and the land-side upright 2 as shown in FIG.

Further, in the state of FIG. 3, the shield machine S
Since the seawater state W is present between the partition wall 17 of the slide hood 6 and the partition wall 9 of the slide hood 6, the drain valve 10 is opened as the shield machine S enters the slide hood 6, and the partition walls 9 and 17 are closed. Drain the seawater between. When the machine S has reached the predetermined position in the hood 6, the machine S is stopped and the seawater between the partition walls 9 and 17 is almost completely drained.

Then, as shown in FIG. 4, the slide hood 6 and the submerged box body 4 are fixed and stopped by welding 18 or the like, the jack 5 is removed, and then the partition wall 9 is removed.
At this time, the water stop between the submerged box body 4 and the slide hood 6 is secured by the first seal 8 and the welding 18,
Water stop between the slide hood 6 and the shield machine S (shield frame 20) is secured by the second seal 11, and water stop between the shield machine S (shield frame 20) and the existing segment 15 is tail seal. Reserved by 16 (see FIG. 5).

Finally, the cutter 19 and the partition wall 17 of the shield machine S are removed, the shield frame 20 of the machine S and the slide hood 6 are fixed by welding or the like to fix and stop the water, and the shield frame 20 and the existing segment 15 are connected. The submerged box 3 on the seabed side and the tunnel T on the land side are connected by welding or the like to fix and stop the water.

Another embodiment is shown in FIGS.

As shown in FIG. 6, in this embodiment, the shield machine S is housed in the submerged box 31 installed on the seabed 30, and the shield machine S is started from the submerged box 31 to move the land side upright 32. It is a digging thing. As shown in FIG. 6, a submerged box 31 is installed on the seabed 30 in the vicinity of the land-side upright 32. Between the submerged box 31 and the land-side upright part 32, a space L which is unavoidable in construction is set as described above. The submerged box 31 has a submerged box main body 33 formed in a tubular shape with concrete or the like, and a slide hood 34 (made of a steel plate) housed in the submerged box main body 33 and protruding and retracted through an opening.

Between the outer peripheral surface of the slide hood 34 and the inner peripheral surface of the submerged box body 33, a pedestal 35 for supporting the slide hood 34 on the submerged box body 33 and aligning the axes of both is provided. Has been done. As the frame 35, the same one as that of the previous embodiment 7 is used. A first seal 36 is provided on the inner peripheral surface on the opening side of the submerged box body 33 to stop water from the outer peripheral surface of the slide hood 34. As the first seal 36, the same thing as the item 8 in the previous embodiment is used. In addition, a second seal 50 is provided on the inner peripheral surface of the slide hood 34 so as to stop the water between the slide hood 34 and a shield frame 37 of the shield machine S described later. As the second seal 50, the same thing as the eleventh embodiment is used.

A shield machine S is housed inside the slide hood 34. The shield machine S includes a cylindrical shield frame 37 and a partition wall 38 for partitioning the inside thereof.
And a cutter 39 rotatably attached to the partition wall 38, and the propelling jack 40 attached to the shield frame 37 is pressed against the existing segment 41 to move forward. The segment 41 is assembled by an erector not shown, and its base end side is fixed to the submerged box body 33. At the rear end of the shield frame 37, a tail seal 42 for stopping water between the shield frame 37 and the existing segment 41 is provided.

Shield frame 37 and slide hood 3
4 can be connected / disconnected by a fixing member 43 (pin or the like). Shield frame 3 by pin 43
7 and the slide hood 34 are connected, the extension of the propulsion jack 40 causes the shield frame 3 to move as shown in FIG.
7 (shield machine S) and the slide hood 34 move forward integrally, and the pin 43 is removed to remove the shield frame 3
If the 7 and the slide hood 34 are separated, as shown in FIG.
Only 7 (Shield Machine S) moves forward.

As shown in FIG. 6, an excavable wall 44 that can be excavated by the cutter 39 of the machine S is provided at the opening of the slide hood 34 to prevent seawater from entering. The excavable wall 44 is made of, for example, mortar mixed with carbon fiber, and the same one as that provided at the starting opening of the vertical shaft when a normal ground shield machine is started from the vertical shaft is used.

A method of launching the shield machine S from the submerged box 31 having the above-described configuration and digging it toward the land-side upright 32 will be described.

First, as shown in FIG.
Is installed near the land-side upright 32 of the seabed 30. At this time, the submerged box 3 is provided between the submerged box 31 and the land-side upright 32.
Due to the installation work of No. 1, a certain gap L is set.

The propulsion jack 40 is provided with the segment 41 as a reaction force receiving member and the submerged box body 33 as a fixed point.
The shield frame 37 and the slide hood 34 are connected to each other by the pin 43.

Next, as shown in FIG. 7, the propulsion jack 4
0 is extended, the shield machine S and the slide hood 34 connected by the pin 43 are integrally advanced, and the slide hood 34 is protruded from the submerged box body 33 until the tip of the slide hood 34 comes into contact with the land-side upright 32. . The slide hood 34 serves as a guide for the shield machine S between the submerged box body 33 and the land-side upright 32.

Next, the pin 43 is removed to close the shield frame hole, and the shield machine S can be moved with respect to the slide hood 34. Then, the propulsion jack 40 is extended while rotating the cutter 39, and as shown in FIG. 8, the excavable wall 44 is excavated by the cutter 39 and the shield machine S is started from the slide hood 34. Then, the shield machine S excavates the land-side upright 32.

As described above, in this embodiment, the slide hood 34 is protruded from the submerged box 31 until it comes into contact with the land side upright portion 32 before the shield machine S is started, so that the slide hood 34 is submerged. Since it serves as a starting guide from the land to the land-side upright 32, it is not necessary to fill the backfill material e as a layer to be excavated between the submerged box f and the land-side upright d as in the type shown in FIG.

Therefore, according to the present embodiment, the submerged box 31
The work of filling the backfill material between the land and the land-side upright 32 is not required, and the waiting time until the backfill material is solidified is also eliminated. Therefore, not only the construction cost can be reduced, but also the construction period can be shortened. That is, according to this embodiment, even if the space L which is unavoidable in construction is set between the submerged box 31 and the land-side upright 32, the backfill between the submerged box 31 and the land-side upright 32 is performed. There is no need to fill the material.

In addition, the shield machine S in the submerged box 31
Travels in the slide hood 34 at an interval L up to the land-side upright portion 32, so even if the specific gravity (specific gravity including internal air) is smaller than seawater, it does not float up and is guided to the slide hood 34. It will be started in that direction. Then, the shield machine S coming out of the slide hood 34 excavates the land-side upright 32 made of relatively hard rock, so that sinking due to gravity does not occur. Therefore, the shield machine S is guided by the slide hood 34 and accurately started from the submerged box 31, and the land side upright 32
Can be excavated and the tunnel can be constructed exactly along the planned line.

Further, in the state of FIG. 8, the submerged box body 3
Water is stopped by the first seal 36 between the slide hood 34 and the slide hood 34, and water is stopped by the second seal 50 between the slide hood 34 and the shield frame 37.
Since the tail seal 42 stops water between the existing segment 41 and the existing segment 41, seawater does not enter the mine.

Further, even if the water stop of the first seal 36 and the second seal 50 is broken, the water is finally stopped by the tail seal 42 to prevent the intrusion of water into the mine. Then, it is possible to omit the first seal 36 and the second seal 50. That is, when the shield machine S further advances from the state of FIG. 8, the shield frame 37 is disengaged from the position opposite to the second seal 50, so that the water stoppage of the second seal 50 does not work, but at that time, the tail seal 42 moves into the pit. Of water is prevented.

[0046]

As described above, according to the present invention, the following effects can be exhibited.

(1) According to the "submerged box for a submarine tunnel" of claim 1, the submerged box for a submarine and the land side tunnel can be accurately connected at low cost and in a short period of time.

(2) According to the "method of reaching the submerged box to the shield machine" according to claim 2, even if there is a space between the submerged box on the seabed and the land-side upright part, it is necessary to refill it. Without
The shield machine excavated from the land side can be accurately entered into the submerged box.

(3) According to the "method of starting a shield machine from a submerged box" according to claim 3, even if there is a space between the submerged box on the seabed and the land-side upright part, it is necessary to refill it. Without, it is possible to accurately launch the shield machine in the submerged box to the landside standing upper part.

[Brief description of drawings]

FIG. 1 is a side sectional view showing “a submerged box for a submarine tunnel” according to an embodiment of the present invention and showing a first step of “a method for reaching a submerged box by a shield machine”.

[Fig. 2] Above "How to reach the shield box by the shield machine"
It is a sectional side view which shows the 2nd process of.

[Fig.3] Above "How to reach the shield box by the shield machine"
It is a sectional side view which shows the 3rd process of.

[Fig. 4] "How to reach a submerged box by a shield machine" above
It is a sectional side view which shows the 4th process of.

5 is an enlarged view showing a sealed state of FIGS. 3 and 4. FIG.

FIG. 6 is a side sectional view showing “a submerged box for a submarine tunnel” according to another embodiment of the present invention and showing a first step of “a method for starting a shield machine from the submerged box”.

FIG. 7 is a side sectional view showing a second step of the “method of starting a shield machine from a submerged box”.

FIG. 8 is a side sectional view showing a third step of the “method of starting a shield machine from a submerged box”.

FIG. 9 is a side cross-sectional view showing “a method for reaching a submerged box by a shield machine” that the present inventors have previously devised.

[Explanation of symbols]

1 seabed 2 Land side upper part 3 submerged boxes 4 submerged box body 6 slide hood 30 seabed 31 submerged box 32 Land upper part 33 Submerged box body 34 Slide Hood

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hirano Itsu             1-25-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo Taisei             Construction Co., Ltd. (72) Inventor Masahiko Tsuchiya             1-25-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo Taisei             Construction Co., Ltd. (72) Inventor Masatoshi Kimura             1-25-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo Taisei             Construction Co., Ltd. (72) Inventor Takanobu Miki             11-11 Kitahamacho, Chita City, Aichi Prefecture Ishikawajima Harima             Heavy industry Aichi factory (72) Inventor Makoto Sugimori             11-11 Kitahamacho, Chita City, Aichi Prefecture Ishikawajima Harima             Heavy industry Aichi factory F term (reference) 2D054 AA04 AC01 AD20 EA09                 2D055 EA00 LA02

Claims (3)

[Claims] 1. A submersible tunnel body characterized in that a submerged box main body that is submerged to form a subsea tunnel is provided with a slide hood that serves as a guide when the shield machine starts and arrives so as to be retractable. Submerged box. 2. A slide hood from the opening of the submerged box toward the land-side upright part when the shield machine excavated from the land side is received inside the submerged box installed near the land-side upright part of the seabed. The method of reaching the shield machine to the submerged box is characterized in that the shield machine that has been dug from the land side is inserted into the inside of the slide hood. 3. When the shield machine is launched from the inside of the submerged box installed near the land side upright on the seabed to the land side, the slide hood is projected from the opening of the submerged box toward the land side upright. , A method of starting a shield machine from a submerged box, which is characterized in that the shield machine is started from the inside of the slide hood to a land side upright.